421721038 has 8 divisors (see below), whose sum is σ = 647292888. Its totient is φ = 205956744.

The previous prime is 421721029. The next prime is 421721051. The reversal of 421721038 is 830127124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 421720997 and 421721015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2451781 + ... + 2451952.

It is an arithmetic number, because the mean of its divisors is an integer number (80911611).

Almost surely, 2^421721038 is an apocalyptic number.

421721038 is a deficient number, since it is larger than the sum of its proper divisors (225571850).

421721038 is a wasteful number, since it uses less digits than its factorization.

421721038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903778.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 421721038 is about 20535.8476328590. The cubic root of 421721038 is about 749.9087521582.

The spelling of 421721038 in words is "four hundred twenty-one million, seven hundred twenty-one thousand, thirty-eight".